I went into the web gui settings, clicked on 'core' and it went to a black screen started thowing up building messages, said new devices added 15sec restart etc. when it finally finished the movies now play.

Interesting huh.

Plays the audio tracks now as well.

I'm now moving on to checking the one media director that was working in 0.41 but is broken, at the moment. It's hanging at 'initializing udev'